title: [Nitrous oxide emission during denitrification for activated sludge acclimated with methanol as the organic carbon].
abstract: Denitrification of wastewater is one of the important sources of nitrous oxide (N2O). In this study, denitrifies were acclimated in a sequencing batch reactor with methanol and nitrate (NO3(-) -N) as the electron donor and acceptor, respectively. N2O emission during denitrification was examined both in typical cycles and in batch experiments under conditions of different electron acceptors, carbon/nitrogen (C/N) ratios and initial nitrite (NO2(-)-N) concentrations. With methanol as the organic carbon, the N2O emission was high with NO2(-)-N as the electron acceptor and the N2O emission was low with NO3(-) -N as the electron acceptor. The C/N ratios affected the emission of N2O by affecting activities of denitrifiers, and both the activity of denitrifiers and the emission of N2O decreased with decreasing C/N ratios. The N2O emission increased with increasing initial NO2(-) -N concentrations, and a certain range of NO2(-) -N concentrations enhanced the activity of denitrifiers. The N2O emission could be correlated very well with initial NO2(-) -N concentrations.
authors.affiliation: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China. zxf860327@126.com
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Zhai
authors.forename: Cheng-Ai
authors.initials: CA
authors.lastname: Jiang
authors.forename: Guang-Xue
authors.initials: GX
authors.lastname: Wu
authors.forename: Yun-Tao
authors.initials: YT
authors.lastname: Guan
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000737:chemistry; D058440:Denitrification; D000432:Methanol / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D009609:Nitrous Oxide / Q000032:analysis*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry
chemical_list: D002244:Carbon; D000432:Methanol; D009566:Nitrates; D009584:Nitrogen; D009609:Nitrous Oxide; D012722:Sewage; D062065:Wastewater